Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first display device or portion thereof with an animated user interface showing an image in the sequence of our new design;

FIG. 2 is another image thereof;

FIG. 3 is another image thereof;

FIG. 4 is another image thereof;

FIG. 5 is another image thereof;

FIG. 6 is another image thereof;

FIG. 7 is another image thereof;

FIG. 8 is another image thereof;

FIG. 9 is another image thereof;

FIG. 10 is another image thereof;

FIG. 11 is another image thereof;

FIG. 12 is another image thereof;

FIG. 13 is another image thereof;

FIG. 14 is another image thereof; and

FIG. 15 is another image thereof.

FIG. 16 is a front view of a second display device or portion thereof with an animated user interface showing an image in the sequence of our new design;

FIG. 17 is another image thereof;

FIG. 18 is another image thereof;

FIG. 19 is another image thereof;

FIG. 20 is another image thereof;

FIG. 21 is another image thereof;

FIG. 22 is another image thereof;

FIG. 23 is another image thereof;

FIG. 24 is another image thereof;

FIG. 25 is another image thereof;

FIG. 26 is another image thereof;

FIG. 27 is another image thereof;

FIG. 28 is another image thereof;

FIG. 29 is another image thereof; and,

FIG. 30 is another image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-15 and 16-30. The process or period in which one image transitions to another forms no part of the claimed design. The dot-dash broken line perimeter illustrates a display screen or portion thereof, and form no part of the claimed design. The remaining broken lines illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 